Add a command to cycle parentheses () -> [] -> {}

[nbfalcon]

lispy-cycle-parens will cycle parentheses () -> [] -> {} for the list at point. {} only works in clojure-mode.

Currently, there is no keybinding.

[coveralls]

Coverage decreased (-62.8%) to 0.0% when pulling ee7cf40fdec6910dfe133f3647d96094271195fa on nbfalcon:feature/lispy-cycle-parens into 38a7df4cbb16cfe3d62dc8ea98b50e2d9a572e58 on abo-abo:master.